Posting on behalf of @Amritss
As a Roblox developer, it is currently too hard to add pieces of code to be executed in the command bar that span longer than just a line. The command bar is usually used to just add small bits of code before runtime. However, sometimes some developers like myself do need to use code that is longer than just one line.
For example, this is a snippet of code that grants a player’s DataStore key the premium currency. The code is only 16 lines long. But when pasted into the command bar, it can be confusing to read and hard to manage, and requires you to scroll side-to-side to view the rest of it. While you can use the Run Script function for stuff like this, it is not convenient because it requires a separate .txt or .lua file. It’s quicker just to put it in the command bar.
This also creates an issue where if you mistyped something in the command bar, or there was a syntax error, you would have to scroll in the command bar using the arrow keys or mouse clicking which is not easily done.
Suggestions
Option A: Roblox could add a similar system to the current script editor we have, but you can press a button to run the script in the current context
Option B: A multiline scrollbar
If this issue is addressed, it would improve my development experience because it would be much easier to locate syntax errors and typos, and improve general editing in the command bar.